Implement a common Interface for all MenuElements

Also remove CSongMenu and replace it with a factory class

VocaluxeLib/Menu/SongMenu/CSongMenuFactory.cs

@@ -0,0 +1,71 @@
+#region license
+// This file is part of Vocaluxe.
+// 
+// Vocaluxe is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// Vocaluxe is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
+#endregion
+
+using System;
+
+namespace VocaluxeLib.Menu.SongMenu
+{
+    public static class CSongMenuFactory
+    {
+        public static ISongMenu GetSongMenu(SThemeSongMenu theme, int partyModeID)
+        {
+            switch (CBase.Config.GetSongMenuType())
+            {
+                    //case ESongMenu.TR_CONFIG_LIST:
+                    //    _SongMenu = new CSongMenuList();
+                    //    break;
+
+                    //case ESongMenu.TR_CONFIG_DREIDEL:
+                    //    _SongMenu = new CSongMenuDreidel();
+                    //    break;
+                case ESongMenu.TR_CONFIG_TILE_BOARD:
+                    return new CSongMenuTileBoard(theme, partyModeID);
+
+                    //case ESongMenu.TR_CONFIG_BOOK:
+                    //    _SongMenu = new CSongMenuBook();
+                    //    break;
+            }
+            throw new ArgumentException("Invalid songmenu type: " + CBase.Config.GetSongMenuType());
+        }
+
+        /// <summary>
+        ///     Deprecated! Only used for old theme loading.
+        /// </summary>
+        /// <param name="partyModeID"></param>
+        /// <returns></returns>
+        public static ISongMenu GetSongMenu(int partyModeID)
+        {
+            switch (CBase.Config.GetSongMenuType())
+            {
+                    //case ESongMenu.TR_CONFIG_LIST:
+                    //    _SongMenu = new CSongMenuList();
+                    //    break;
+
+                    //case ESongMenu.TR_CONFIG_DREIDEL:
+                    //    _SongMenu = new CSongMenuDreidel();
+                    //    break;
+                case ESongMenu.TR_CONFIG_TILE_BOARD:
+                    return new CSongMenuTileBoard(partyModeID);
+
+                    //case ESongMenu.TR_CONFIG_BOOK:
+                    //    _SongMenu = new CSongMenuBook();
+                    //    break;
+            }
+            throw new ArgumentException("Invalid songmenu type: " + CBase.Config.GetSongMenuType());
+        }
+    }
+}